Pattern #4: Get rid of all OR operators from sql where clauses. For example, consider an SQL requirement to authenticate user by comparing the string entered by the user with either username or email or phone: select u1.* from user u1 where (u1.username = ?1 or u1.email = ?1 or u1.phone = ?1) and u1.password = … Continue reading Migrating SQL applications to Cassandra – Pattern #4